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package net.guerlab.wechat.basic.material.permanent.service;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.http.client.methods.HttpUriRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import net.guerlab.web.client.simple.HttpClient;
import net.guerlab.web.client.simple.HttpHelper;
import net.guerlab.web.client.simple.SimpleHttpClient;
import net.guerlab.wechat.basic.material.permanent.entity.MaterialType;
import net.guerlab.wechat.basic.material.permanent.entity.MulitNewsMaterial;
import net.guerlab.wechat.basic.material.permanent.entity.NewsMaterial;
import net.guerlab.wechat.basic.material.permanent.entity.NewsMaterialList;
import net.guerlab.wechat.core.accessToken.entity.AccessToken;
import net.guerlab.wechat.exception.ServiceCallbackParseHelper;
import net.guerlab.wechat.exception.WeChatException;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

/**
 * 获取永久图文素材列表服务
 * 
 * @author guer
 *
 */
/*
 * 测试通过
 */
public final class GetNewsMaterialListService {

    private static final Logger LOGGER = LoggerFactory.getLogger(GetNewsMaterialListService.class);

    /**
     * 执行方法
     * 
     * @param accessToken
     *            accessToken凭证对象
     * @param offset
     *            从全部素材的该偏移位置开始返回，0表示从第一个素材 返回
     * @param count
     *            返回素材的数量，取值在1到20之间
     * @return 图文素材对象列表
     * @throws WeChatException
     *             当服务产生错误的时候抛出RequestException异常
     */
    public static NewsMaterialList execute(AccessToken accessToken, int offset, int count) throws WeChatException {
        /*
         * 入口检查
         */
        if (accessToken == null) {
            return null;
        }

        /*
         * 构建请求地址
         */
        String url = "https://api.weixin.qq.com/cgi-bin/material/batchget_material?access_token="
                + accessToken.getAccessToken();

        JSONObject params = new JSONObject();
        params.put("type", MaterialType.NEWS.toString().toLowerCase());
        params.put("offset", String.valueOf(offset));
        params.put("count", String.valueOf(count));

        /*
         * 获取响应返回值
         */
        HttpClient httpClient = new SimpleHttpClient();
        HttpUriRequest request = httpClient.post(url, params.toString());
        String result = HttpHelper.getEntity(request);

        if (result == null) {
            return null;
        }

        /*
         * 解析JSON字符串
         */
        JSONObject jsonObject = JSONObject.parseObject(result);

        try {

            WeChatException exception = ServiceCallbackParseHelper.parseException(jsonObject);

            if (exception != null) {
                throw exception;
            }

            NewsMaterialList list = new NewsMaterialList();

            List<MulitNewsMaterial> mulitList = new ArrayList<>();

            /*
             * 填充属性
             */
            list.setTotalCount(jsonObject.getIntValue("total_count"));
            list.setItemCount(jsonObject.getIntValue("item_count"));
            list.setList(mulitList);

            /*
             * 获取元素的json列表
             */
            JSONArray items = jsonObject.getJSONArray("item");

            /*
             * 获取迭代器
             */
            Iterator<Object> iterator = items.iterator();

            /*
             * 遍历元素
             */
            while (iterator.hasNext()) {
                Object obj = iterator.next();
                if (!(obj instanceof JSONObject)) {
                    continue;
                }

                JSONObject object = (JSONObject) obj;

                /*
                 * 获取素材ID
                 */
                String mediaId = object.getString("media_id");

                /*
                 * 创建多图文素材对象
                 */
                MulitNewsMaterial mulit = new MulitNewsMaterial();

                /*
                 * 设置素材ID
                 */
                mulit.setMediaId(mediaId);

                /*
                 * 获取图文素材列表
                 */
                JSONArray newsItems = object.getJSONObject("content").getJSONArray("news_item");

                List<NewsMaterial> newsItemList = new ArrayList<>();

                if (newsItems != null) {

                    /*
                     * 获取迭代器对象
                     */
                    Iterator<Object> itemsIterator = newsItems.iterator();

                    while (itemsIterator.hasNext()) {
                        Object newsObj = itemsIterator.next();
                        if (!(newsObj instanceof JSONObject)) {
                            continue;
                        }

                        JSONObject newsItem = (JSONObject) newsObj;

                        /*
                         * 创建图文素材对象
                         */
                        NewsMaterial news = new NewsMaterial();

                        /*
                         * 填充属性
                         */
                        news.setTitle(newsItem.getString("title"));
                        news.setThumbMediaId(newsItem.getString("thumb_media_id"));
                        news.setAuthor(newsItem.getString("author"));
                        news.setDigest(newsItem.getString("digest"));
                        news.setContent(newsItem.getString("content"));
                        news.setUrl(newsItem.getString("url"));
                        news.setContentSourceUrl(newsItem.getString("content_source_url"));
                        news.setShowCoverPic("1".equals(newsItem.getString("show_cover_pic")));

                        /*
                         * 添加元素到列表中
                         */
                        newsItemList.add(news);

                    }
                }

                mulit.setList(newsItemList);
                mulitList.add(mulit);
            }

            return list;
        } catch (WeChatException e) {
            throw e;
        } catch (Exception e) {
            LOGGER.debug(e.getMessage(), e);
        }

        return null;
    }
}
